CN103341787B - The numerical control machining cutter radius compensation method of feature based - Google Patents
The numerical control machining cutter radius compensation method of feature based Download PDFInfo
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Abstract
A kind of Cutter Radius Compensation Method of feature based, it is characterized in that first carrying out feature identification, based on the characteristic results identified, process decision is carried out to part, export processing cutter rail file afterwards, in cutter rail file except comprising cutter location information, also comprise the characteristic type needed for cutter radius compensation, processing mode, cutter radius compensation contact point information.Cutter rail file is inputted in postpositive disposal module, according to characteristic information and processing mode information determination cutter radius compensation type, and adopt corresponding cutter radius compensation algorithm to carry out cutter radius compensation to original APT cutter rail file, generate the nc program of new coupling.Wherein cutter radius compensation type comprises side milling compensation, end mill compensates and end mill side milling mixed compensation type, and often kind compensates type and has corresponding cutter radius compensation algorithm.Present invention achieves the cutter radius compensation in aircraft structure processing, make the radius compensation of cutter in five-axis robot more effective.
Description
Technical field
The present invention relates to a kind of numerical control machining cutter radius compensation method, particularly relate to a kind of numerical control machining cutter radius compensation method of feature based, a cutter rail radius compensation method for feature based specifically, thus make full use of non-standard sharpening cutter, reduce the cost of charp tool of part processing.
Background technology
Aircraft structure size is large, and complex structure, machining feature is many, and comprise a large amount of free form surface, intersecting features and special machining area, difficulty of processing is large.In the digital control processing generative process of aircraft structure, programing work amount is large, the technological preparation time is long, and the numerical control programming of aircraft structure becomes one of important bottleneck affecting the aircraft development cycle day by day.
Due in Flight Structures NC Machining process, cutter can produce wearing and tearing after the processing of certain hour, can not process according to its standard size again.For reducing costs, tool sharpening (i.e. grinding knife tool blade) to another size, can put into production and process by enterprise again.But compile institute's calling program due to journey to generate according to the original standard size of cutter, the cutter after sharpening cannot use original program to process.Due to aircraft large-sized structural parts process operation substantial amounts, process if regenerate cutter rail according to the size after sharpening, add the workload that journey compiles personnel to a great extent; If do not use sharpening cutter, then can cause again the huge waste of operation resource.When journey volume workload is growing and processing cost promotes day by day, sets up process tool radius compensation method, make full use of existing non-standard sharpening cutter, the cost of charp tool reducing aircraft structure processing is very necessary.
Compensation way after tool wear in digital control processing comprises tool length compensation and cutter radius compensation two kinds.Tool length compensation problem be can solve by RTCP merit in existing high-grade digital control system.For Cutting Tool Radius Compensation, existing business system or the cutter radius compensation of academic research to bottom milling or side milling realize.Just compensate based on the motion conditions of cutter rail with upper slitter rail radius compensation method, in the aircraft structure process of complexity, only from cutter rail geological information, the compensation demand of tool radius cannot be known.And by the analysis to aircraft structure processing characteristic, in aircraft structure processing, various processing method mixing exists, for each work step in aircraft structure processing or operation, do not have the scheme of systematic cutter compensation at present, make above-mentioned Tool Compensation be difficult to realize; There is more end mill and side milling in simultaneously aircraft structure processing and the structure of depositing, and directly utilize existing method also cannot solve the problem of cutter radius compensation.
The present invention is by the basis of existing end mill and side milling Tool Compensation, based on the characteristic of the feature of aircraft structure, set up the cutter compensation model under different characteristic, to be characterized as the integrated Tool Compensation of carrier, realize aircraft structure Cutter Radius Compensation Method.
Summary of the invention
The object of the invention is just to need to regenerate new procedure for changing once tool radius in existing Complex Parts NC Machining Process, cause programming complicated, the problem that cycle is long, invent a kind of numerical control machining cutter radius compensation method of feature based, to solve existing Flight Structures NC Machining process tool radius compensation problem, make full use of the sharpening cutter of existing off-standard size, reduce the cost of charp tool of aircraft structure processing.
Technical scheme of the present invention is:
A numerical control machining cutter radius compensation method for feature based, is characterized in that comprising the following steps:
Step 1, utilizes part C AD threedimensional model to carry out feature identification to it, obtains part machining feature;
Step 2, based on part feature recognition result, carries out process decision to part, and process decision content comprises processing mode, machined parameters and processing and drives geometry to extract;
Step 3, generates the APT file comprising cutter location information, machining feature information and process operation information, as the basis of postpositive disposal cutter radius compensation;
Step 4, using the APT file generated as the input of postpositive disposal module; Determine whether to need to carry out cutter radius compensation and cutter radius compensation type according to the characteristic information in tool radius information and APT file, processing mode information;
Step 5, if need to carry out cutter radius compensation, then according to the cutter radius compensation type determination cutter radius compensation vector determined in step 4;
Step 6, if need to carry out cutter radius compensation, is then biased the cutter location in APT file according to the cutter radius compensation vector calculated in step 5, obtains new cutter location information, and then generate nc program; Otherwise directly generate nc program;
Step 7, if tool radius changes, will not need from step 2, only need repetition step 4,5,6 can obtain tool radius change after nc program; Thus realize the quick realization of cutter radius compensation, new nc program is dropped in digital control processing production fast.
In the APT file of described generation except comprising processing cutter location essential information, also comprise the machining feature information for determining cutter radius compensation type and processing mode information.
Described cutter radius compensation type comprises: side milling compensation, end mill compensate and end mill side milling mixed compensation; Backoff algorithm corresponding to cutter radius compensation type is: side milling backoff algorithm, end mill backoff algorithm and end mill side milling mixed compensation algorithm.
The Cutter Radius Compensation Method of described feature based be based upon cutter radius compensation type and machining feature and processing mode mapping relations on;
Cutter radius compensation type with the mapping relations of machining feature and processing mode is:
Muscle feature machining: the processing of muscle Interim, belongs to end mill and compensates type; The processing of muscle top feature does not need to compensate;
Groove web feature machining: the processing of horizonal web plate, does not need to compensate; The processing of skew web plate, belongs to end mill side milling mixed compensation type;
Groove type feature machining: if adopt three axis machining, then belong to side milling and compensate type; If employing five-axis robot, then belong to end mill side milling mixed compensation type;
Groove corner feature machining: if adopt three axis machining, then belong to side milling and compensate type; If employing five-axis robot, then belong to end mill side milling mixed compensation type; Processing non-cylindrical corner, belongs to end mill and compensates type;
Contour machining: belong to side milling and compensate type.
The method for solving of described cutter radius compensation vector is:
Cutter radius compensation vector is obtained to bias vector synthesis by cutter side direction vector sum cutter shaft; The cutter radius compensation vector m of side direction; For the machining shaft of skew web plate to bias vector n; For the processing machining shaft closing angle inner mold and corner to bias vector n be:
Wherein, R is original tool radius, R
cthe tool radius after tool wear,
be the angle of cutter vector and part web surface, the direction of n is contrary with cutter axis orientation;
Vectorial m and vector n are carried out synthesizing and just obtains cutter radius compensation vector.
Beneficial effect of the present invention:
Conventional tool radius compensation method just based on the motion conditions of cutter rail, in the aircraft structure process of complexity, cannot know the compensation demand of cutter rail.
With the feature of aircraft structure for carrier, provide the cutter radius compensation information adding man-hour, on the basis ensureing Flight Structures NC Machining crudy, make the carrying out that cutter compensation can be correct.Make the radius compensation of cutter in five-axis robot more effective.
Accompanying drawing explanation
Fig. 1 is the flow chart of the Cutter Radius Compensation Method of feature based of the present invention.
Fig. 2 is a Typical Aircraft structural member.
Fig. 3 is the characteristic series chart of aircraft structure identification of the present invention.
Fig. 4 is that the skew web plate processing under multi views compensates schematic diagram.
Fig. 5 is that inner mold processing compensates schematic diagram.
Fig. 6 is groove web processing APT file.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further illustrated.
For a typical aircraft structure, as shown in Figure 2.But the present invention is not limited in this part.Adopt C Plus Plus to realize the aircraft structure Cutter Radius Compensation Method of feature based, the CAD/CAM software platform of employing is CATIA, and development platform is CATIA secondary developing platform CAA.
As shown in figures 1 to 6.
A numerical control machining cutter radius compensation method for feature based, it comprises the following steps:
1, an aircraft structure threedimensional model based on CAD is input in CAM software, feature identification is carried out to part model.Feature knows method for distinguishing by automatically identifying based on the method for attribute face edge graph, also can extract the characteristic information of part by the interaction feature RM manually clicked.Feature recognition result contains the full detail of each feature of this part.The feature list obtained after identification as shown in Figure 3;
2, based on the feature recognition result obtained in 1, carry out processing technology decision-making to part, the content of process decision comprises: processing mode, machined parameters and processing drive the acquisition of geometry.Wherein processing mode comprises three axis machining mode and five-axis robot mode; Machined parameters comprises cutting-in, it is wide to cut, rotating speed, feeding, tool path pattern etc.; Processing drives geometry can pass through directly obtain feature neutron feature geometries or adopt geometry automatic reconfiguration method to obtain;
3, based on the information such as part feature, Processing Strategies Tool-path Generation information.Because feature geometries and processing mode determine the mode of process tool compensation, therefore in cutter rail file, except the information of cutter rail point position, characteristic information mark, processing mode message identification and tool contact dot information etc. are needed to be stored in APT file, as the basis of postpositive disposal cutter radius compensation.Web processes the APT file that obtains as shown in Figure 6.
4, using the APT file generated as the input of postpositive disposal module, determine whether all to need to carry out cutter radius compensation according to tool radius information.If tool radius does not change, do not need to compensate tool radius, otherwise compensate.If need to compensate, according to the characteristic information in APT file and processing mode information determination cutter radius compensation type.The mapping relations of feature, processing mode and compensation type are as shown in the table:
| Feature | Subcharacter | Processing mode | Compensate type |
| Groove | Horizonal web plate | Three axles | Uncompensated |
| Groove | Skew web plate | Three axles | End mill side milling mixed compensation type |
| Groove | Groove type | Three axles | Side milling compensates type |
| Groove | Groove type | Five axles | End mill side milling mixed compensation type |
| Groove | Groove corner | Three axles | Side milling compensates type |
| Groove | Groove corner | Five axles | End mill side milling mixed compensation type |
| Groove | Non-cylindrical groove corner | Three axles | End mill compensates type |
| Muscle | Muscle top | Three axles | Uncompensated |
| Muscle | Muscle transition | Three axles | End mill compensates type |
| Profile | - | Three axles | Side milling compensates type |
| Profile | - | Five axles | Side milling compensates type |
Concrete often kind of feature and processing mode with the pass compensating type are:
1) muscle feature
A) muscle top Milling Process, it adopts cutter bottom level motion milling muscle top, and the change for cutter does not need to compensate;
B) muscle transition subcharacter processing, belongs to end mill and compensates type.
2) groove web feature
A) for the processing of level trough web, cut web according to bottom cutter, then do not need to compensate.
B) skew web plate is the novel difficult processing structure of one occurred in aircraft structure, shown in figure 4.For skew web plate processing, due to the requirement of machined surface quality, skew web plate needs and its adjacent horizonal web plate is processed jointly, forms overall cutter rail.Therefore, need cutter rail to judge, determination methods is as follows:
Line between some position, front and back is out-of-level, and the cutter rail entering skew web plate part is just described; Once the cutter rail level of front and back line, and line is before out-of-level, then illustrate that cutter rail transfers horizonal web plate part to from skew web plate.
Above-mentioned situation is processed respectively:
1. for when horizontal component web carries out milling, then uncompensation;
When 2. milling being carried out for sloping portion, then compensate.When sloping portion compensates, the vector of compensation is divided into two parts, pre-compensation vector sum side direction compensation vector.Pre-compensation vector is because cutter shear blade cuts skew web plate, if tool radius diminishes, then exists and owes to cut phenomenon.Side direction compensation vector is due to profile in cutter flank milling, if tool radius diminishes, then exists and owes to cut phenomenon.Therefore end mill side milling mixed compensation type is belonged to.
3) groove type feature
A) three axis machining groove type, belongs to side milling and compensates type;
B) five-axis robot groove type, because its side edge and shear blade participate in milling in processing simultaneously, belongs to end mill side milling mixed compensation type.
4) groove corner subcharacter,
A) three axis machining groove corner, belongs to side milling and compensates type;
B) five-axis robot groove corner, identical with five-axis robot groove type, belong to end mill side milling mixed compensation type;
C) non-cylindrical groove corner, identical with the processing of muscle transition subcharacter, belong to end mill and compensate type;
5) contour feature,
No matter be adopt three axis machining or five-axis robot contour feature, all belong to side milling and compensate type.
5, for different cutter radius compensation types, corresponding backoff algorithm determination cutter radius compensation vector is adopted.Compensating for end mill compensation and side milling all to adopt existing Cutter Radius Compensation Method to try to achieve.
Solving of end mill side milling mixed compensation vector need be classified according to the difference of feature:
1) processing of skew web plate
When sloping portion compensates, the vector of compensation is divided into two parts, holds to compensation vector and side direction compensation vector.Holding to compensation vector is because cutter shear blade cuts skew web plate, if tool radius diminishes, then exists and owes to cut phenomenon.Side direction compensation vector is due to profile in cutter flank milling, if tool radius diminishes, then exists and owes to cut phenomenon.Hold to compensation vector conveniently end mill compensation method acquisition, side direction compensation vector conveniently side milling compensation method obtains, and both synthesis can be compensated vector.
2) angle inner mold corner processing is closed
Algorithm principle is with reference to shown in figure 5, and the compensation vector of cutter is now the synthesis of cutter side direction vector sum axial vector.Cutter side direction vector m tries to achieve according to existing side milling Cutter Radius Compensation Method.The computational methods of the axial vector n of cutter are as follows:
Tool inclination angle α is calculated by generating tool axis vector in APT file and horizontal relation of plane.And according to the geometrical relationship of cutter and machined part, the value of axial vector n can be obtained:
the direction of n is contrary with generating tool axis vector direction simultaneously, can obtain n.Therefore calculate m+n and be required cutter radius compensation vector.
6, according to the cutter radius compensation vector of trying to achieve in 5, the cutter location in APT file is biased, obtains new cutter location information, and then generate nc program; Biasing means is:
In formula, O is original cutter location, and O ' is the cutter location after being biased, and P is cutter radius compensation vector.
If 7 tool radius change, will not need from step 2, and only need repeat the nc program that step 4,5,6 can obtain after tool radius change.Thus realize the quick realization of cutter compensation, new nc program is dropped in digital control processing production fast.
Part that the present invention does not relate to is realized with the existing identical prior art that maybe can adopt of technology.
Claims (4)
1. a numerical control machining cutter radius compensation method for feature based, is characterized in that comprising the following steps:
Step 1, utilizes part C AD threedimensional model to carry out feature identification to it, obtains part machining feature;
Step 2, based on part feature recognition result, carries out process decision to part, and process decision content comprises processing mode, machined parameters and processing and drives geometry to extract;
Step 3, generates the APT file comprising cutter location information, machining feature information and process operation information, as the basis of postpositive disposal cutter radius compensation;
Step 4, using the APT file generated as the input of postpositive disposal module; Determine whether to need to carry out cutter radius compensation and cutter radius compensation type according to the characteristic information in tool radius information and APT file, processing mode information;
Step 5, if need to carry out cutter radius compensation, then according to the cutter radius compensation type determination cutter radius compensation vector determined in step 4, and cutter radius compensation type with the mapping relations of machining feature and processing mode is:
Muscle feature machining: the processing of muscle Interim, belongs to end mill and compensates type; The processing of muscle top feature does not need to compensate;
Groove web feature machining: the processing of horizonal web plate, does not need to compensate; The processing of skew web plate, belongs to end mill side milling mixed compensation type;
Groove type feature machining: if adopt three axis machining, then belong to side milling and compensate type; If employing five-axis robot, then belong to end mill side milling mixed compensation type;
Groove corner feature machining: if adopt three axis machining, then belong to side milling and compensate type; If employing five-axis robot, then belong to end mill side milling mixed compensation type; Processing non-cylindrical corner, belongs to end mill and compensates type;
Contour machining: belong to side milling and compensate type;
Step 6, if need to carry out cutter radius compensation, is then biased the cutter location in APT file according to the cutter radius compensation vector calculated in step 5, obtains new cutter location information, and then generate nc program; Otherwise directly generate nc program;
Step 7, if tool radius changes, will not need from step 2, only need repetition step 4,5,6 can obtain tool radius change after nc program; Thus realize the quick realization of cutter radius compensation, new nc program is dropped in digital control processing production fast.
2. compensation method as claimed in claim 1, is characterized in that processing except cutter location essential information except comprising in the APT file of described generation, also comprising the machining feature information for determining cutter radius compensation type and processing mode information.
3. compensation method as claimed in claim 1, is characterized in that described cutter radius compensation type comprises: side milling compensation, end mill compensate and end mill side milling mixed compensation; Backoff algorithm corresponding to cutter radius compensation type is: side milling backoff algorithm, end mill backoff algorithm and end mill side milling mixed compensation algorithm.
4. compensation method as claimed in claim 1, is characterized in that the method for solving of described cutter radius compensation vector is:
Cutter radius compensation vector is obtained to bias vector synthesis by cutter side direction vector sum cutter shaft; The cutter radius compensation vector m of side direction; For the machining shaft of skew web plate to bias vector n; For the processing machining shaft closing angle inner mold and corner to bias vector n be:
Wherein, R is original tool radius, R
cthe tool radius after tool wear,
be the angle of cutter vector and part web surface, the direction of n is contrary with cutter axis orientation;
Vectorial m and vector n are carried out synthesizing and just obtains cutter radius compensation vector.
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| DE3226244A1 (en) * | 1982-07-14 | 1984-01-26 | Friedrich Deckel AG, 8000 München | METHOD AND DEVICE FOR COMPENSATING TOOL WEAR FOR A BORING BAR |
| JP3671020B2 (en) * | 2002-04-09 | 2005-07-13 | ファナック株式会社 | Numerical controller |
| CN101670532B (en) * | 2008-09-08 | 2011-06-22 | 鸿富锦精密工业（深圳）有限公司 | Tool wear-compensating system and method |
| CN102622477B (en) * | 2012-03-01 | 2013-12-18 | 北京航空航天大学 | Three-dimensional process model evolution generation method applied to digitalized process design |
| CN103135498B (en) * | 2013-01-25 | 2015-07-29 | 南京工程学院 | A kind of numerically-controlled machine contour machining radius error compensating control method and device |
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